Saddle-type vehicle equipped with a navigation system

ABSTRACT

A GPS antenna is arranged such that it can easily receive satellite radio waves. An ATV is a saddle-type vehicle equipped with a navigation system for measuring the position of the vehicle by receiving radio waves from an artificial satellite. A meter box is mounted to a front portion of the vehicle, and a GPS unit is mounted in an upper portion of the meter box. A GPS antenna is mounted to the top of the GPS unit. A second GPS antenna is mounted to a rear fender to enable diversity reception.

BACKGROUND OF THE INVENTION CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority under 35 USC 119 to Japanese Patent Application Nos. 2002-265661 filed on Sep. 11, 2002 the entire contents thereof are hereby incorporated by reference.

FIELD OF THE INVENTION

[0002] The present invention relates to a saddle-type vehicle equipped with a navigation system and, particularly, to a saddle-type vehicle equipped with a navigation system, which comprises a GPS receiver suitable for receiving data from a satellite with high sensitivity.

DESCRIPTION OF BACKGROUND ART

[0003] A navigation system is widely used which uses a combination of a global positioning system for measuring the location of a mobile station making use of radio waves transmitted from an artificial satellite and map information to display the current location of a vehicle on a map and navigates a user to his/her destination.

[0004] In this navigation system, care must be taken for the arrangement of a sensor (GPS antenna) for receiving radio waves from an artificial satellite in order to prevent a reception failure which occurs when the sensor is hidden behind a movable member such as the steering handle of a vehicle or a driver. For example, Japanese Laid-open Patent Application No. 9-95276 discloses a motorcycle equipped with a GPS antenna which is arranged before the moving locus of the handlebar in a forward direction of the vehicle.

[0005] Since the GPS antenna is arranged in front of the steering handle in the above prior art device, radio waves coming from a forward direction in front of the steering handle are not cut off by the steering handle. However, the height of the GPS antenna is not taken into full consideration. For instance, in an ATV, a carrier may be placed in front of the steering handle. Therefore, the GPS antenna is hidden behind baggage placed on the carrier in this case.

SUMMARY AND OBJECTS OF THE INVENTION

[0006] It is an object of the present invention to solve the above problem of the prior art by providing a saddle-type vehicle equipped with a navigation system that includes a GPS receiver and takes into consideration the arrangement of a GPS antenna in order to prevent radio waves from a satellite from being cut off by things other than the steering handle.

[0007] To attain the above object, the first feature of the present invention is the provision of a saddle-type vehicle equipped with a navigation system for measuring the vehicle's location by receiving radio waves from an artificial satellite that includes a meter box mounted to a front portion of the body, a GPS unit mounted in an upper portion of the meter box and a GPS antenna mounted on the top of the GPS unit.

[0008] According to the first feature, since the GPS antenna is mounted on the top of the meter box installed at a relatively high position on the vehicle so that a driver can easily see it, satellite radio waves can be received at a wide range.

[0009] The second feature of the present invention is that the vehicle further comprises a pole extending upward from a fender covering wheels and a second GPS antenna mounted to the top of the pole so that diversity reception is made possible with the GPS antenna of the GPS unit.

[0010] According to the second feature, the diversity reception of radio waves from the satellite is made possible with high sensitivity by using two GPS antennas installed at high positions on the body.

[0011] The third feature of the present invention is that a carrier for mounting baggage is provided in the front and rear of the body. According to the third feature, even when baggage is placed on the carriers installed at the front and rear of the body and a front view is taken into consideration, the height of the baggage does not become too large, thereby making it possible to easily receive satellite radio waves with the GPS antenna installed at a relatively high position of the body.

[0012] Further, the fourth feature of the present invention is that the above meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit and a cover for covering the GPS unit and the indicator.

[0013] According to the fourth feature of the present invention, since the GPS unit and the indicator are arranged in proximity to each other and covered with the same cover, harnesses for interconnecting the GPS unit and the indicator can be shortened, the production becomes easy and the appearance of the vehicle becomes good.

[0014] Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

[0016]FIG. 1 is a perspective view of a saddle-type vehicle equipped with a navigation system according to the present invention;

[0017]FIG. 2 is a perspective view of a meter box including a navigation system mounted to the vehicle of FIG. 1; and

[0018]FIG. 3 is a diagram showing the receivable range of satellite radio waves.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention will be described in detail hereinbelow with reference to the accompanying drawings. FIG. 1 is a perspective view of an ATV 1 as a vehicle equipped with a GPS receiver according to an embodiment of the present invention. ATV 1 has a seat 4 situated between front wheels 2 and rear wheels 3 having balloon tires and a fuel tank 5 located in front of the seat 4. A steering handle 6 and a meter box 7 installed at the center of the steering handle 6, and a section in front of the steering handle 6 is covered with a front fender 8 are provided in front of the fuel tank 5. A front carrier 9 for mounting baggage is provided on the top of the front fender 8. On the rear wheel 3 side, there are provided a rear fender 10 and a rear carrier 11. An engine and a four wheel drive unit for transmitting the power of the engine to the front wheels 2 and the rear wheels 3 are arranged below the seat 4.

[0020] The GPS receiver and a GPS antenna 12 for a navigation system which will be described in detail hereinafter are installed in the meter box 7. Particularly, the GPS antenna 12 is arranged at the highest position of the meter box 7. That is, in ATV 1, as illustrated in the FIG. 1, the meter box 7 is situated at the highest position of the vehicle, and the GPS antenna 12 is located at the highest position of the meter box 7. This is aimed to receive satellite radio waves with high sensitivity. The meter box 7 is covered with a cover 13.

[0021] The satellite radio waves are mainly received by the GPS antenna 12 installed in the meter box 7. A second GPS antenna 14 may be mounted on the rear fender 10 or the like. This makes possible diversity reception that the satellite radio waves can be received better. It is recommended to mount the second GPS antenna 14 to the distal end of a pole 14 a set in the rear fender 10 so that radio waves can be received at a higher position. The GPS antenna 14 may be mounted to not only on the rear fender 10 but also any one of the fenders covering the four wheels.

[0022]FIG. 2 is an exploded perspective view of the meter box 7 when seen from the front of the vehicle. In FIG. 2, the meter box 7 has frames 16 fixed to the support member 15 of the steering handle 6, and an indicator 17 and a GPS unit 18 are held to the frames 16. The indicator 17 is arranged such that its screen is opposite to a driver so that he/she can easily see it. The GPS unit 18 is arranged before the indicator 17 in a forward direction of the vehicle, and the GPS antenna 12 is situated almost at the same height as the upper end of the indicator 17. The GPS unit 18 calculates position information based on satellite radio waves received by the GPS antenna 12 and the running distance and direction of the vehicle.

[0023] The indicator 17 has a display panel for displaying information on the driving states of ATV 1 such as the speed of the vehicle and the exchange time of engine oil and information on the location of the vehicle based on satellite radio waves received by the GPS unit 18. The position information can be displayed together with a map.

[0024]FIG. 3 is a diagram showing the receivable range of satellite radio waves. FIG. 3 is based on the assumption that baggage 19 is placed on the front carrier 9. Ranges where satellite radio waves to be received by the GPS antenna 12 are cut off by the baggage 19 and the driver D are denoted by C1 and C2, respectively. Since the GPS antenna 12 is installed at a high position of ATV 1 as can be understood from FIG. 1, the ranges of satellite radio waves cut off by the baggage 19 and the driver can be narrowed, and the satellite radio waves can be received well at a wide angle range (W).

[0025] Since the GPS unit 18 including the GPS antenna 12 is installed adjacent to the indicator 17, harnesses for interconnecting the GPS unit 18 and the indicator 17 can be shortened.

[0026] Since the GPS unit 18 including the GPS antenna 12 is installed adjacent to the indicator 17, the GPS unit 18 and the indicator 17 can be covered with the same cover 13, thereby making it possible to prevent a complicated front section of the vehicle that results from an increase in the number of covers.

[0027] Since the indicator is installed at a high position in ATV 1 in most cases, high-sensitivity reception is possible with the GPS unit 18 installed at a high position by arranging the GPS unit 18 and the indicator 17 adjacent to each other without making other modifications.

[0028] The present invention can be particularly advantageously applied to a four-wheeled ATV. It can be also applied to a two-wheeled or three-wheeled saddle-type vehicle.

[0029] As obvious from the above description, according to the present invention, since the GPS antenna is installed at a relatively high position of the vehicle, satellite radio waves can be received at a wide range and navigation information can be obtained with high accuracy.

[0030] According to the present invention, diversity reception is made possible with high sensitivity by using two GPS antennas installed at high positions of the vehicle.

[0031] According to the present invention, even when baggage is placed on carriers installed at the front and rear of the vehicle, as the baggage does not become too high when a front view is taken into consideration, satellite radio waves can be received well by the GPS antenna installed at a relatively high position of the vehicle.

[0032] According to the present invention, since the GPS unit and the indicator are arranged in proximity to each other and are covered with the same cover, harnesses for interconnecting the GPS unit and the indicator can be shortened, the production becomes easy and the appearance of the vehicle becomes good.

[0033] The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A saddle-type vehicle equipped with a navigation system for measuring its own location by receiving radio waves from an artificial satellite, comprising: a meter box mounted to a front portion of the vehicle; a GPS unit mounted in an upper portion of the meter box; and a GPS antenna mounted on the top of the GPS unit.
 2. The saddle-type vehicle equipped with a navigation system according to claim 1, and further including a pole extending upward from a fender covering wheels and a second GPS antenna mounted on the top of the pole to enable diversity reception with the GPS antenna in the GPS unit.
 3. The saddle-type vehicle equipped with a navigation system according to claim 1, wherein a carrier for mounting baggage is installed at the front and rear of the vehicle.
 4. The saddle-type vehicle equipped with a navigation system according to claim 2, wherein a carrier for mounting baggage is installed at the front and rear of the vehicle.
 5. The saddle-type vehicle equipped with a navigation system according to claim 1, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator.
 6. The saddle-type vehicle equipped with a navigation system according to claim 2, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator.
 7. The saddle-type vehicle equipped with a navigation system according to claim 3, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator.
 8. A navigation system adapted to be used with a saddle-type vehicle for measuring a location of a vehicle by receiving radio waves from an artificial satellite, comprising: a meter box adapted to be mounted to a front portion of a vehicle; a GPS unit operatively positioned in said meter box and mounted in an upper portion of the meter box; and a GPS antenna operatively mounted on the top of the GPS unit.
 9. The navigation system according to claim 8, and further including a pole adapted to extend upwardly from a fender covering wheels and a second GPS antenna mounted on the top of the pole to enable diversity reception with the GPS antenna in the GPS unit.
 10. The navigation system according to claim 8, wherein a carrier for mounting baggage is adapted to be installed at the front and rear of the vehicle.
 11. The navigation system according to claim 9, wherein a carrier for mounting baggage is adapted to be installed at the front and rear of the vehicle.
 12. The navigation system according to claim 8, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator.
 13. The navigation system according to claim 9, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator.
 14. The navigation system according to claim 10, wherein the meter box comprises the GPS unit, an indicator for indicating position information supplied from the GPS unit, and a cover for covering the GPS unit and the indicator. 